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Note 13 - Employee Benefits - Option Activity (Details)
 12 Months Ended
Dec. 31, 2020
$ / shares
shares
Balance, shares (in shares) | shares 1,263,513
Balance, weighted average exercise price (in dollars per share) | $ / shares $ 9.87
Granted, shares (in shares) | shares 41,500
Granted, weighted average exercise price (in dollars per share) | $ / shares $ 15.37
Exercised, shares (in shares) | shares (580,933)
Exercised, weighted average exercise price (in dollars per share) | $ / shares $ 8.25
Forfeited, shares (in shares) | shares (12,300)
Forfeited, weighted average exercise price (in dollars per share) | $ / shares $ 12.37
Balance, shares (in shares) | shares 711,780
Balance, weighted average exercise price (in dollars per share) | $ / shares $ 11.47
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares) | shares 379,218
Balance, weighted average exercise price (in dollars per share) | $ / shares $ 9.97